Do I need seperate price lists for VAT sale & CST sale

1. Yes, bcoz if you will sell the things without 'C' form or other form then you have to bear the cost of that tax part, so you need to keep or maintain seperate price list for central sales to avoid that cost on you. But if you sell with 'c' form then work on your cost and sell the things on margin which are on your hand only.

2. Yes, you need to show CST part seperately.

  In your price list show only the basic price. in the invoices show the tax chrged separately. With 'C' form,without 'C' form and local sales at local rates of VAT. Then there is no need for separate price lists.